i heard this enteresting theory about The Mouth of Sauron could have been A blue wizard? Cause it did say they could have been currupted by sauron and even been one of his Luetinaments. Also MOuth of sauron says "Old Grey Beard" which i think he might have known him?
well i thought this was a prettyt cool thought.

The Mouth of Sauron is a Black Numenorean who became ensnared by Sauron and fell into his service utterly, even to the point of forgetting his own name. Simple as that.

well i knew that but you never know

But it's so fun to think about the theories! I mean, maybe one of the Blue Wizards WAS a Black Numenorean! Unlikely and probably impossible, I know....but it's still fun...

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Well i suppose there is a very remote possibility he is a Blue wizard, but no more a possibility than Gandalf is Tom Bombadil.

Yeah, but it's still fun to explore the possibilities, no?

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It's an interesting theory, but it just wouldn't fit right with the history. As Lord of all mentioned the Mouth of Sauron was a Black Numenorien, which would mean that he could not be an Istari [or Blue Wizard for that matter]. There is also the fact that the Blue Wizards went in the complete opposite direction of Sauron when they set out on their journey's.

Interesting theory though!